1.1 init.zygote.rc 配置
service zygote /system/bin/app_process64 -Xzygote /system/bin --zygote --start-system-server // 1.2 app_process
class main
socket zygote stream 660 root system // 创建一个名为zygote，类型为stream，权限为660的socket
onrestart write /sys/android_power/request_state wake // zygote重启的时候，写入字符
onrestart write /sys/power/state on
onrestart restart audioserver // zygote重启的时候，重启audioserver
onrestart restart cameraserver
onrestart restart media
onrestart restart netd
writepid /dev/cpuset/foreground/tasks /dev/stune/foreground/tasks
1.2 app_process 模块
# frameworks/base/cmds/app_process/Android.mk
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
app_main.cpp // 解析init.rc zygote
...
LOCAL_SHARED_LIBRARIES := \
libdl \
libcutils \
libutils \
liblog \
libbinder \
libnativeloader \
libandroid_runtime // 1.3 libandroid_runtime 模块
LOCAL_MODULE:= app_process
LOCAL_MULTILIB := both
LOCAL_MODULE_STEM_32 := app_process32 // 32位
LOCAL_MODULE_STEM_64 := app_process64
...
include $(BUILD_EXECUTABLE)
- app_process 依赖共享库 libandroid_runtime；
- app_process 模块会构建出可执行文件app_process32 app_process64 ，对应于zygote32 zygote64
1.3 libandroid_runtime 模块
# frameworks/base/core/jni/Android.mk
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
...
LOCAL_SRC_FILES:= \ // framework下所有JNI
AndroidRuntime.cpp \
android_util_Binder.cpp \
com_android_internal_os_Zygote.cpp
LOCAL_C_INCLUDES += \
...
$(TOP)/system/core/include \
LOCAL_SHARED_LIBRARIES := \
liblog \
libbinder \
libnetutils \
libinput \
libinputflinger \
...
libmedia \
libjpeg \
# we need to access the private Bionic header
# <bionic_tls.h> in com_google_android_gles_jni_GLImpl.cpp
LOCAL_C_INCLUDES += bionic/libc/private
# AndroidRuntime.h depends on nativehelper/jni.h
LOCAL_EXPORT_C_INCLUDE_DIRS := libnativehelper/include
LOCAL_MODULE:= libandroid_runtime
...
include $(BUILD_SHARED_LIBRARY)
include $(call all-makefiles-under,$(LOCAL_PATH))
- 封装了系统frameworks/base/core/jni 中的jni库，
- 系统libcore、system 等仓库C环境的头文件
- 并依赖libmedia 等其他系统库文件；
1.4 App_main.cpp 解析init.zygote.rc
int main(int argc, char* const argv[])
{
AppRuntime runtime(argv[0], computeArgBlockSize(argc, argv));
...
// Parse runtime arguments. Stop at first unrecognized option.
bool zygote = false;
bool startSystemServer = false;
bool application = false;
String8 niceName;
String8 className;
++i; // Skip unused "parent dir" argument.
while (i < argc) { // 参数处理
const char* arg = argv[i++];
if (strcmp(arg, "--zygote") == 0) {
zygote = true;
niceName = ZYGOTE_NICE_NAME;
} else if (strcmp(arg, "--start-system-server") == 0) {
startSystemServer = true;
} else if (strcmp(arg, "--application") == 0) {
application = true;
} else if (strncmp(arg, "--nice-name=", 12) == 0) {
niceName.setTo(arg + 12);
} else if (strncmp(arg, "--", 2) != 0) {
className.setTo(arg);
break;
} else {
--i;
break;
}
}
Vector<String8> args;
if (!className.isEmpty()) {
args.add(application ? String8("application") : String8("tool"));
runtime.setClassNameAndArgs(className, argc - i, argv + i);
} else {
...
if (startSystemServer) { // 需要启动SystemServer
args.add(String8("start-system-server"));
}
...
for (; i < argc; ++i) {
args.add(String8(argv[i]));
}
}
if (zygote) {
runtime.start("com.android.internal.os.ZygoteInit", args, zygote); // 1.6
} else if (className) {
runtime.start("com.android.internal.os.RuntimeInit", args, zygote);
}
}
1.5 AppRuntime类图
AppRuntime
AppRuntime继承自AndroidRuntime，并重写部分方法
1.6 AndroidRuntime::start
string.
*/
void AndroidRuntime::start(const char* className, const Vector<String8>& options, bool zygote)
{
...
/* start the virtual machine */
JniInvocation jni_invocation;
jni_invocation.Init(NULL);
JNIEnv* env;
if (startVm(&mJavaVM, &env, zygote) != 0) { // 1.7 创建虚拟机
return;
}
onVmCreated(env);
/*
* Register android functions.
*/
if (startReg(env) < 0) { // 注册JNI
ALOGE("Unable to register all android natives\n");
return;
}
...
/*
* Start VM. This thread becomes the main thread of the VM, and will
* not return until the VM exits.
*/
char* slashClassName = toSlashClassName(className);
jclass startClass = env->FindClass(slashClassName);
if (startClass == NULL) {
ALOGE("JavaVM unable to locate class '%s'\n", slashClassName);
/* keep going */
} else {
jmethodID startMeth = env->GetStaticMethodID(startClass, "main",
"([Ljava/lang/String;)V");
if (startMeth == NULL) {
ALOGE("JavaVM unable to find main() in '%s'\n", className);
/* keep going */
} else {
env->CallStaticVoidMethod(startClass, startMeth, strArray); // 2.1 com.android.internal.os.ZygoteInit main方法
}
}
...
}
1.7 AndroidRuntime::startVM
// Start the Dalvik Virtual Machine.
int AndroidRuntime::startVm(JavaVM** pJavaVM, JNIEnv** pEnv, bool zygote)
{
...
/*
* The default starting and maximum size of the heap. Larger
* values should be specified in a product property override.
*/
parseRuntimeOption("dalvik.vm.heapstartsize", heapstartsizeOptsBuf, "-Xms", "4m");
parseRuntimeOption("dalvik.vm.heapsize", heapsizeOptsBuf, "-Xmx", "16m");
...
/*
* JIT related options.
*/
parseRuntimeOption("dalvik.vm.jitmaxsize", jitmaxsizeOptsBuf, "-Xjitmaxsize:");
...
/*
* Initialize the VM.
*
* The JavaVM* is essentially per-process, and the JNIEnv* is per-thread.
* If this call succeeds, the VM is ready, and we can start issuing
* JNI calls.
*/
if (JNI_CreateJavaVM(pJavaVM, pEnv, &initArgs) < 0) {
ALOGE("JNI_CreateJavaVM failed\n");
return -1;
}
}
2.1 ZygoteInit::main
public static void main(String argv[]) {
...
String socketName = "zygote";
// Mark zygote start. This ensures that thread creation will throw
// an error.
ZygoteHooks.startZygoteNoThreadCreation();
try {
boolean startSystemServer = false;
String abiList = null;
for (int i = 1; i < argv.length; i++) { // 参数解析
if ("start-system-server".equals(argv[i])) {
startSystemServer = true;
} else if (argv[i].startsWith(ABI_LIST_ARG)) {
abiList = argv[i].substring(ABI_LIST_ARG.length());
} else if (argv[i].startsWith(SOCKET_NAME_ARG)) {
socketName = argv[i].substring(SOCKET_NAME_ARG.length());
} else {
throw new RuntimeException("Unknown command line argument: " + argv[i]);
}
}
registerZygoteSocket(socketName); // 2.2 注册Socket
...
preloadByName(socketName); // 2.3 预加载资源
if (startSystemServer) { // 2.4 启动SystemServer
startSystemServer(abiList, socketName);
}
runSelectLoop(abiList); // 2.5 循环监听请求
closeServerSocket();
} catch (MethodAndArgsCaller caller) {
caller.run(); // 调用Application::main或者SystemServer::main; 这是SystemServer参考4.1
} catch (RuntimeException ex) {
closeServerSocket(); // RuntimeException，则关闭Socket
}
}
2.2 ZygoteInit::registerZygoteSocket
/**
* Registers a server socket for zygote command connections
*
* @throws RuntimeException when open fails
*/
private static void registerZygoteSocket(String socketName) {
if (sServerSocket == null) {
int fileDesc;
final String fullSocketName = ANDROID_SOCKET_PREFIX + socketName;
try {
String env = System.getenv(fullSocketName);
fileDesc = Integer.parseInt(env);
} catch (RuntimeException ex) {
throw new RuntimeException(fullSocketName + " unset or invalid", ex);
}
try {
FileDescriptor fd = new FileDescriptor();
fd.setInt$(fileDesc);
sServerSocket = new LocalServerSocket(fd); // 监听zygote
} catch (IOException ex) {
throw new RuntimeException(
"Error binding to local socket '" + fileDesc + "'", ex);
}
}
}
2.3 ZygoteInit::preload
static void preload() {
preloadClasses(); // /system/etc/preloaded-classes
preloadResources();
// frameworks/base/core/res/res/values/arrays.xml 中的
// preloaded_drawables、preloaded_color_state_lists、preloaded_freeform_multi_window_drawables
preloadOpenGL();
preloadSharedLibraries(); // android、compiler_rt、jnigraphics
preloadTextResources();
WebViewFactory.prepareWebViewInZygote();
endIcuCachePinning();
warmUpJcaProviders();
}
2.4 ZygoteInit::startSystemServer
private static boolean startSystemServer(String abiList, String socketName)
throws MethodAndArgsCaller, RuntimeException {
...
String args[] = {
"--setuid=1000",
"--setgid=1000",
/// M: ANR mechanism for system_server add shell(2000) group to access
/// /sys/kernel/debug/tracing/tracing_on
"--setgroups=1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1018,1021,1032,2000," +
"3001,3002,3003,3006,3007,3009,3010",
"--capabilities=" + capabilities + "," + capabilities,
"--nice-name=system_server",
"--runtime-args",
"com.android.server.SystemServer", // SystemServer
};
ZygoteConnection.Arguments parsedArgs = null;
int pid;
try {
parsedArgs = new ZygoteConnection.Arguments(args); // 封装参数
ZygoteConnection.applyDebuggerSystemProperty(parsedArgs);
ZygoteConnection.applyInvokeWithSystemProperty(parsedArgs);
/* Request to fork the system server process */
pid = Zygote.forkSystemServer( // linux::fork
parsedArgs.uid, parsedArgs.gid,
parsedArgs.gids,
parsedArgs.debugFlags,
null,
parsedArgs.permittedCapabilities,
parsedArgs.effectiveCapabilities);
} catch (IllegalArgumentException ex) {
throw new RuntimeException(ex);
}
/* For child process */
if (pid == 0) {
if (hasSecondZygote(abiList)) {
waitForSecondaryZygote(socketName);
}
handleSystemServerProcess(parsedArgs); // 3.1 进入SystemServer进程
}
return true;
}
2.5 ZygoteInit::runSelectLoop
private static void runSelectLoop(String abiList) throws MethodAndArgsCaller {
ArrayList<FileDescriptor> fds = new ArrayList<FileDescriptor>();
ArrayList<ZygoteConnection> peers = new ArrayList<ZygoteConnection>();
fds.add(sServerSocket.getFileDescriptor());
peers.add(null);
while (true) {
StructPollfd[] pollFds = new StructPollfd[fds.size()];
for (int i = 0; i < pollFds.length; ++i) {
pollFds[i] = new StructPollfd();
pollFds[i].fd = fds.get(i);
pollFds[i].events = (short) POLLIN;
}
try {
Os.poll(pollFds, -1); // Linux poll机制，当有消息时唤醒
} catch (ErrnoException ex) {
throw new RuntimeException("poll failed", ex);
}
for (int i = pollFds.length - 1; i >= 0; --i) {
if ((pollFds[i].revents & POLLIN) == 0) {
continue;
}
if (i == 0) {
ZygoteConnection newPeer = acceptCommandPeer(abiList);
peers.add(newPeer);
fds.add(newPeer.getFileDesciptor());
} else {
boolean done = peers.get(i).runOnce(); // ZygoteConnection::runOnce
if (done) {
peers.remove(i);
fds.remove(i);
}
}
}
}
}
3.1 ZygoteInit::handleSystemServerProcess
private static void handleSystemServerProcess(
ZygoteConnection.Arguments parsedArgs)
throws ZygoteInit.MethodAndArgsCaller {
closeServerSocket(); // 关闭从zygote CopyonWrite来的Socket
// set umask to 0077 so new files and directories will default to owner-only permissions.
Os.umask(S_IRWXG | S_IRWXO);
if (parsedArgs.niceName != null) {
Process.setArgV0(parsedArgs.niceName); // 设置进程name
}
final String systemServerClasspath = Os.getenv("SYSTEMSERVERCLASSPATH");
// /system/framework下的services.jar、ethernet-service.jar、wifi-service.jar做dex优化处理
if (systemServerClasspath != null) {
performSystemServerDexOpt(systemServerClasspath);
}
if (parsedArgs.invokeWith != null) { // 普通应用程序走这里
String[] args = parsedArgs.remainingArgs;
// If we have a non-null system server class path, we'll have to duplicate the
// existing arguments and append the classpath to it. ART will handle the classpath
// correctly when we exec a new process.
if (systemServerClasspath != null) {
String[] amendedArgs = new String[args.length + 2];
amendedArgs[0] = "-cp";
amendedArgs[1] = systemServerClasspath;
System.arraycopy(parsedArgs.remainingArgs, 0, amendedArgs, 2, parsedArgs.remainingArgs.length);
}
WrapperInit.execApplication(parsedArgs.invokeWith,
parsedArgs.niceName, parsedArgs.targetSdkVersion,
VMRuntime.getCurrentInstructionSet(), null, args);
} else {
ClassLoader cl = null;
if (systemServerClasspath != null) {
cl = createSystemServerClassLoader(systemServerClasspath,
parsedArgs.targetSdkVersion); // 3.2
Thread.currentThread().setContextClassLoader(cl);
}
/*
* Pass the remaining arguments to SystemServer.
*/
RuntimeInit.zygoteInit(parsedArgs.targetSdkVersion, parsedArgs.remainingArgs, cl); // 3.3
}
}
3.2 ZygoteInit::createSystemServerClassLoader
private static PathClassLoader createSystemServerClassLoader(String systemServerClasspath,
int targetSdkVersion) {
String librarySearchPath = System.getProperty("java.library.path"); // java.library.path=null
return PathClassLoaderFactory.createClassLoader(systemServerClasspath, // system/framework/service.jar等
librarySearchPath, // null
null /* libraryPermittedPath */,
ClassLoader.getSystemClassLoader(), // 默认PathClassLoader
targetSdkVersion,
true /* isNamespaceShared */); // 返回 PathClassLoader
}
3.3 RuntimeInit::zygoteInit
public static final void zygoteInit(int targetSdkVersion, String[] argv, ClassLoader classLoader)
throws ZygoteInit.MethodAndArgsCaller {
redirectLogStreams(); // Redirect System.out and System.err to the Android log.
commonInit(); // 设置未捕获异常、时区、重置log、网络统计等
nativeZygoteInit(); // 启动Binder线程
applicationInit(targetSdkVersion, argv, classLoader); // 3.4
}
3.4 RuntimeInit::applicationInit
private static void applicationInit(int targetSdkVersion, String[] argv, ClassLoader classLoader)
throws ZygoteInit.MethodAndArgsCaller {
...
// We want to be fairly aggressive about heap utilization, to avoid
// holding on to a lot of memory that isn't needed.
VMRuntime.getRuntime().setTargetHeapUtilization(0.75f);
VMRuntime.getRuntime().setTargetSdkVersion(targetSdkVersion);
final Arguments args = new Arguments(argv);
// Remaining arguments are passed to the start class's static main
invokeStaticMain(args.startClass, args.startArgs, classLoader); // 3.5
}
3.5 RuntimeInit::invokeStaticMain
private static void invokeStaticMain(String className, String[] argv, ClassLoader classLoader)
throws ZygoteInit.MethodAndArgsCaller {
Class<?> cl = Class.forName(className, true, classLoader);
Method m = cl.getMethod("main", new Class[] { String[].class });
...
throw new ZygoteInit.MethodAndArgsCaller(m, argv); // 2.1
}
清空调用栈，使其看起来像直接进入main函数
4.1 SystemServer::main
public static void main(String[] args) {
new SystemServer().run();
}
4.2 SystemServer::run
private void run() {
...
VMRuntime.getRuntime().clearGrowthLimit();
// The system server has to run all of the time, so it needs to be
// as efficient as possible with its memory usage.
VMRuntime.getRuntime().setTargetHeapUtilization(0.8f);
...
Looper.prepareMainLooper(); // 创建SystemServer主线程
// Initialize native services.
System.loadLibrary("android_servers");
// Check whether we failed to shut down last time we tried.
// This call may not return.
performPendingShutdown();
// Initialize the system context.
createSystemContext(); // 4.3
// Create the system service manager.
mSystemServiceManager = new SystemServiceManager(mSystemContext);
LocalServices.addService(SystemServiceManager.class, mSystemServiceManager);
...
// Start services.
try {
startBootstrapServices(); // 5.1
startCoreServices(); // 5.1
startOtherServices(); // 5.1
} catch (Throwable ex) {
Slog.e("System", "******************************************");
Slog.e("System", "************ Failure starting system services", ex);
throw ex;
}
...
Looper.loop(); // 启动SystemServer主线程
throw new RuntimeException("Main thread loop unexpectedly exited");
}
4.3 SystemServer::createSystemContext
private void createSystemContext() {
ActivityThread activityThread = ActivityThread.systemMain(); // 4.4
mSystemContext = activityThread.getSystemContext();
mSystemContext.setTheme(DEFAULT_SYSTEM_THEME);
}
4.4 ActivityThread::systemMain
public static ActivityThread systemMain() {
...
ActivityThread thread = new ActivityThread();
thread.attach(true); // 4.5
return thread;
}
4.5 ActivityThread::attach
private void attach(boolean system) {
sCurrentActivityThread = this;
mSystemThread = system;
if (!system) {
// 普通进程
} else {
android.ddm.DdmHandleAppName.setAppName("system_process",
UserHandle.myUserId()); // 修改进程名字
mInstrumentation = new Instrumentation();
ContextImpl context = ContextImpl.createAppContext(
this, getSystemContext().mPackageInfo); // 4.6
mInitialApplication = context.mPackageInfo.makeApplication(true, null);
mInitialApplication.onCreate();
}
...
}
4.6 System Context创建流程
ActivityThread::getSystemContext
ContextImpl::createSystemContext
LoadedApk::LoadedApk
new ContextImpl
4.7 LoadedApk构建流程
LoadedApk(ActivityThread activityThread) {
mActivityThread = activityThread;
mApplicationInfo = new ApplicationInfo();
mApplicationInfo.packageName = "android"; // framework-res.apk
mPackageName = "android";
...
mClassLoader = ClassLoader.getSystemClassLoader();
mResources = Resources.getSystem();
}
5.1 SystemServer 服务启动流程
SystemServer Service Start Phase
启动SystemUI位于550-600之间,在AMS调用SystemReady过程中新启线程来执行的;
6.1 ZygoteConnection::runOnce
boolean runOnce() throws ZygoteInit.MethodAndArgsCaller {
String args[] = readArgumentList();
int pid = -1;
...
pid = Zygote.forkAndSpecialize(parsedArgs.uid, parsedArgs.gid, parsedArgs.gids,
parsedArgs.debugFlags, rlimits, parsedArgs.mountExternal, parsedArgs.seInfo,
parsedArgs.niceName, fdsToClose, parsedArgs.instructionSet,
parsedArgs.appDataDir);
...
if (pid == 0) {
// in child
IoUtils.closeQuietly(serverPipeFd);
serverPipeFd = null;
handleChildProc(parsedArgs, descriptors, childPipeFd, newStderr); // 6.2
// should never get here, the child is expected to either
// throw ZygoteInit.MethodAndArgsCaller or exec().
return true;
} else {
// in parent...pid of < 0 means failure
IoUtils.closeQuietly(childPipeFd);
childPipeFd = null;
return handleParentProc(pid, descriptors, serverPipeFd, parsedArgs);
}
}
Zygote孵化新的进程
Zygote孵化新的进程
6.2 ZygoteConnection::handleChildProc
private void handleChildProc(Arguments parsedArgs,
FileDescriptor[] descriptors, FileDescriptor pipeFd, PrintStream newStderr)
throws ZygoteInit.MethodAndArgsCaller {
/**
* By the time we get here, the native code has closed the two actual Zygote
* socket connections, and substituted /dev/null in their place. The LocalSocket
* objects still need to be closed properly.
*/
closeSocket();
ZygoteInit.closeServerSocket(); // 关闭socket
if (parsedArgs.niceName != null) {
Process.setArgV0(parsedArgs.niceName);
}
// End of the postFork event.
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
if (parsedArgs.invokeWith != null) {
WrapperInit.execApplication(parsedArgs.invokeWith,
parsedArgs.niceName, parsedArgs.targetSdkVersion,
VMRuntime.getCurrentInstructionSet(),
pipeFd, parsedArgs.remainingArgs);
} else {
RuntimeInit.zygoteInit(parsedArgs.targetSdkVersion,
parsedArgs.remainingArgs, null /* classLoader */); // 3.3
}
}
6.4 Java服务展现概览
Java服务展现概览
参考
图解Android – Zygote, System Server 启动分析
7.1 Zygote 启动日志
$ adb logcat -s Zygote
--------- beginning of main
--------- beginning of system
01-01 08:01:21.453 284 284 D Zygote : begin preload
01-01 08:01:21.453 284 284 I Zygote : Installing ICU cache reference pinning...
01-01 08:01:21.453 284 284 I Zygote : Preloading ICU data...
01-01 08:01:21.502 284 284 I Zygote : Preloading ICU data --- End
01-01 08:01:21.503 284 284 I Zygote : Preloading classes... // 加载class
01-01 08:01:22.557 284 284 I Zygote : ...preloaded 4161 classes in 1054ms.
01-01 08:01:22.898 284 284 I Zygote : Preloading resources...
01-01 08:01:23.279 284 284 I Zygote : ...preloaded 114 resources in 381ms.
01-01 08:01:23.295 284 284 I Zygote : ...preloaded 41 resources in 15ms.
01-01 08:01:23.296 284 284 I Zygote : Preloading OpenGL...
01-01 08:01:23.465 284 284 I Zygote : Preloading OpenGL --- End
01-01 08:01:23.465 284 284 I Zygote : Preloading shared libraries...
01-01 08:01:23.472 284 284 I Zygote : Preloading shared libraries --- End
01-01 08:01:23.472 284 284 I Zygote : Preloading TextResources...
01-01 08:01:23.497 284 284 I Zygote : Preloading TextResources --- End
01-01 08:01:23.499 284 284 I Zygote : Uninstalled ICU cache reference pinning...
01-01 08:01:23.503 284 284 I Zygote : Installed AndroidKeyStoreProvider in 4ms.
01-01 08:01:23.535 284 284 I Zygote : Warmed up JCA providers in 32ms.
01-01 08:01:23.536 284 284 D Zygote : end preload
01-01 08:01:23.676 284 284 I Zygote : System server process 1022 has been created // SystemServer创建成功
01-01 08:01:23.681 284 284 I Zygote : Accepting command socket connections // 监听通过Socket传递的请求
01-01 08:06:19.004 1022 1022 I Zygote : Process: zygote socket opened, supported ABIS: armeabi-v7a,armeabi
7.2 SystemServer::startBootstrapServices
private void startBootstrapServices() {
// Wait for installd to finish starting up so that it has a chance to
// create critical directories such as /data/user with the appropriate
// permissions. We need this to complete before we initialize other services.
Installer installer = mSystemServiceManager.startService(Installer.class);
...
// Activity manager runs the show.
mActivityManagerService = mSystemServiceManager.startService(
ActivityManagerService.Lifecycle.class).getService();
...
// Power manager needs to be started early because other services need it.
// Native daemons may be watching for it to be registered so it must be ready
// to handle incoming binder calls immediately (including being able to verify
// the permissions for those calls).
mPowerManagerService = mSystemServiceManager.startService(PowerManagerService.class);
// Manages LEDs and display backlight so we need it to bring up the display.
mSystemServiceManager.startService(LightsService.class);
// Display manager is needed to provide display metrics before package manager
// starts up.
mDisplayManagerService = mSystemServiceManager.startService(DisplayManagerService.class);
// We need the default display before we can initialize the package manager.
mSystemServiceManager.startBootPhase(SystemService.PHASE_WAIT_FOR_DEFAULT_DISPLAY);
...
traceBeginAndSlog(""StartPackageManagerService""); // 7.3
}
7.3 System Service 启动日志
adb logcat -s SystemServer
--------- beginning of main
--------- beginning of system
01-01 08:01:43.754 1022 1022 I SystemServer: Entered the Android system server! // after zygote Accepting command socket connections
01-01 08:01:44.442 1022 1022 I SystemServer: StartPackageManagerService
01-01 08:04:20.324 1022 1022 I SystemServer: StartOtaDexOptService
01-01 08:04:20.462 1022 1022 I SystemServer: StartUserManagerService
01-01 08:04:20.517 1022 1022 I SystemServer: Reading configuration...
01-01 08:04:20.517 1022 1022 I SystemServer: StartSchedulingPolicyService
01-01 08:04:20.519 1022 1022 I SystemServer: StartTelephonyRegistry
01-01 08:04:20.524 1022 1022 I SystemServer: StartEntropyMixer
01-01 08:04:20.535 1022 1022 I SystemServer: Camera Service
01-01 08:04:20.538 1022 1022 I SystemServer: StartAccountManagerService
01-01 08:04:20.545 1022 1022 I SystemServer: StartContentService
01-01 08:04:20.548 1022 1022 I SystemServer: InstallSystemProviders
01-01 08:04:21.534 1022 1022 I SystemServer: StartVibratorService
01-01 08:04:21.539 1022 1022 I SystemServer: StartAlarmManagerService
01-01 08:04:21.565 1022 1022 I SystemServer: InitWatchdog
01-01 08:04:21.567 1022 1022 I SystemServer: StartInputManagerService
01-01 08:04:21.570 1022 1022 I SystemServer: StartWindowManagerService
01-01 08:04:21.680 1022 1022 I SystemServer: StartVrManagerService
01-01 08:04:21.812 1022 1022 I SystemServer: ConnectivityMetricsLoggerService
01-01 08:04:21.813 1022 1022 I SystemServer: PinnerService
01-01 08:04:21.890 1022 1022 I SystemServer: StartAccessibilityManagerService
01-01 08:06:12.596 1022 1022 I SystemServer: StartLockSettingsService
01-01 08:06:12.663 1022 1022 I SystemServer: StartStatusBarManagerService
01-01 08:06:12.668 1022 1022 I SystemServer: StartClipboardService
01-01 08:06:12.671 1022 1022 I SystemServer: StartNetworkManagementService
01-01 08:06:12.709 1022 1022 I SystemServer: StartNetworkScoreService
01-01 08:06:12.712 1022 1022 I SystemServer: StartNetworkStatsService
01-01 08:06:12.735 1022 1022 I SystemServer: StartNetworkPolicyManagerService
01-01 08:06:12.740 1022 1022 I SystemServer: No Wi-Fi NAN Service (NAN support Not Present)
01-01 08:06:13.042 1022 1022 I SystemServer: StartConnectivityService
01-01 08:06:13.101 1022 1022 I SystemServer: StartNsdService
01-01 08:06:13.107 1022 1022 I SystemServer: StartDataShapingService
01-01 08:06:13.110 1022 1022 I SystemServer: StartUpdateLockService
01-01 08:06:13.236 1022 1022 I SystemServer: StartLocationManagerService
01-01 08:06:13.242 1022 1022 I SystemServer: StartCountryDetectorService
01-01 08:06:13.243 1022 1022 I SystemServer: StartSearchManagerService
01-01 08:06:13.247 1022 1022 I SystemServer: Search Engine Service
01-01 08:06:13.252 1022 1022 I SystemServer: StartWallpaperManagerService
01-01 08:06:13.258 1022 1022 I SystemServer: StartAudioService
01-01 08:06:13.331 1022 1022 I SystemServer: StartWiredAccessoryManager
01-01 08:06:13.399 1022 1022 I SystemServer: StartSerialService
01-01 08:06:13.541 1022 1022 I SystemServer: Gesture Launcher Service
01-01 08:06:13.545 1022 1022 I SystemServer: StartDiskStatsService
01-01 08:06:13.546 1022 1022 I SystemServer: StartSamplingProfilerService
01-01 08:06:13.637 1022 1022 I SystemServer: StartNetworkTimeUpdateService
01-01 08:06:13.639 1022 1022 I SystemServer: StartCommonTimeManagementService
01-01 08:06:13.641 1022 1022 I SystemServer: CertBlacklister
01-01 08:06:13.645 1022 1022 I SystemServer: StartAssetAtlasService
01-01 08:06:13.691 1022 1022 I SystemServer: StartMediaRouterService
01-01 08:06:18.318 1022 1022 I SystemServer: StartBackgroundDexOptService
01-01 08:06:18.345 1022 1022 I SystemServer: RunningBoosterService
01-01 08:06:18.922 1022 1022 I SystemServer: Making services ready
01-01 08:06:19.056 1022 1022 I SystemServer: WebViewFactory preparation
01-01 00:00:00.216 1022 1022 I SystemServer: Enabled StrictMode for system server main thread.
